com.bbn.openmap.proj
Class LLXY

java.lang.Object
  |
  +--com.bbn.openmap.proj.Proj
        |
        +--com.bbn.openmap.proj.Cylindrical
              |
              +--com.bbn.openmap.proj.LLXY

All Implemented Interfaces:

java.lang.Cloneable, EqualArc, Projection, java.io.Serializable

Direct Known Subclasses:

LLXYView

public class LLXY

extends Cylindrical

implements EqualArc

Implements the LLXY projection, which is basically something where the lat/lon and pixel ratios are the same.

See Also:

Serialized Form

Field Summary

protected float	cLat
protected float	cLon
protected int	hy
static java.lang.String	LLXYName The LLXY name.
static int	LLXYType The LLXY type of projection.
protected float	ppd Pixel per degree
protected int	wx

Fields inherited from class com.bbn.openmap.proj.Cylindrical

half_world, world

Fields inherited from class com.bbn.openmap.proj.Proj

ctrLat, ctrLon, DATELINE, height, maxscale, mercator, MIN_HEIGHT, MIN_WIDTH, minscale, NORTH_POLE, NUM_DEFAULT_CIRCLE_VERTS, NUM_DEFAULT_GREAT_SEGS, pixelsPerMeter, planetPixelCircumference, planetPixelRadius, planetRadius, projID, scale, scaled_radius, SOUTH_POLE, type, width, XSCALE_THRESHOLD, XTHRESHOLD

Constructor Summary

LLXY(LatLonPoint center, float scale, int width, int height)
Construct a LLXY projection.

LLXY(LatLonPoint center, float scale, int width, int height, int type)

Method Summary

protected void	computeParameters() Called when some fundamental parameters change.
java.awt.Point	forward(float lat, float lon, java.awt.Point p) Forward projects a lat,lon coordinates.
java.awt.Point	forward(float lat, float lon, java.awt.Point p, boolean isRadian) Forward projects lat,lon into XY space and returns a Point.
java.awt.Point	forward(LatLonPoint pt, java.awt.Point p) Projects a point from Lat/Lon space to X/Y space.
java.lang.String	getName() Get the name string of the projection.
double	getXPixConstant() Returns the x pixel constant of the projection.
double	getYPixConstant() Returns the y pixel constant of the projection.
LatLonPoint	inverse(int x, int y, LatLonPoint llp) Inverse project x,y coordinates into a LatLonPoint.
LatLonPoint	inverse(java.awt.Point pt, LatLonPoint llp) Inverse project a Point.
boolean	isPlotable(float lat, float lon) Checks if a LatLonPoint is plot-able.
float	normalize_latitude(float lat) Sets radian latitude to something sane.
java.lang.String	toString() Return stringified description of this projection.

Methods inherited from class com.bbn.openmap.proj.Cylindrical

_forwardPoly, drawBackground, drawBackground, forwardRaw, getLowerRight, getUpperLeft, pan

Methods inherited from class com.bbn.openmap.proj.Proj

clone, doPolyDispatch, equals, forward, forward, forwardArc, forwardArc, forwardArc, forwardCircle, forwardCircle, forwardCircle, forwardGreatPoly, forwardLine, forwardLine, forwardPoly, forwardPoly, forwardRaster, forwardRect, forwardRect, forwardRect, forwardRhumbPoly, getCenter, getHeight, getMaxScale, getMinScale, getPlanetPixelCircumference, getPlanetPixelRadius, getPlanetRadius, getPPM, getProjectionID, getProjectionType, getScale, getScale, getWidth, hashCode, inverse, inverse, isComplicatedLineType, isPlotable, makeClone, pan, panE, panE, panN, panN, panNE, panNE, panNW, panNW, panS, panS, panSE, panSE, panSW, panSW, panW, panW, setCenter, setCenter, setHeight, setMaxScale, setMinScale, setParms, setPlanetRadius, setPPM, setProjectionID, setScale, setWidth, wrap_longitude

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface com.bbn.openmap.proj.Projection

forward, forward, forwardArc, forwardCircle, forwardLine, forwardPoly, forwardRaster, forwardRaw, forwardRect, getCenter, getHeight, getLowerRight, getMaxScale, getMinScale, getProjectionID, getProjectionType, getScale, getScale, getUpperLeft, getWidth, inverse, inverse, isPlotable, makeClone, pan, pan

Field Detail

LLXYName

public static final transient java.lang.String LLXYName

The LLXY name.

See Also:

Constant Field Values

LLXYType

public static final transient int LLXYType

The LLXY type of projection.

See Also:

Constant Field Values

hy

protected int hy

wx

protected int wx

cLon

protected float cLon

cLat

protected float cLat

ppd

protected float ppd

Pixel per degree

Constructor Detail

LLXY

public LLXY(LatLonPoint center,
            float scale,
            int width,
            int height)

Construct a LLXY projection.

Parameters:

center - LatLonPoint center of projection

scale - float scale of projection

width - width of screen

height - height of screen

LLXY

public LLXY(LatLonPoint center,
            float scale,
            int width,
            int height,
            int type)

Method Detail

toString

public java.lang.String toString()

Return stringified description of this projection.

Overrides:

toString in class Cylindrical

Returns:

String

See Also:

Projection.getProjectionID()

computeParameters

protected void computeParameters()

Called when some fundamental parameters change. Each projection will decide how to respond to this change. For instance, they may need to recalculate "constant" paramters used in the forward() and inverse() calls.

Overrides:

computeParameters in class Cylindrical

normalize_latitude

public float normalize_latitude(float lat)

Sets radian latitude to something sane. This is an abstract function since some projections don't deal well with extreme latitudes.

Specified by:

normalize_latitude in class Proj

Parameters:

lat - float latitude in radians

Returns:

float latitude (-PI/2 <= y <= PI/2)

See Also:

LatLonPoint.normalize_latitude(float)

isPlotable

public boolean isPlotable(float lat,
                          float lon)

Checks if a LatLonPoint is plot-able. A point is always plot-able in the LLXY projection.

Specified by:

isPlotable in interface Projection

Parameters:

lat - float latitude in decimal degrees

lon - float longitude in decimal degrees

Returns:

boolean

forward

public java.awt.Point forward(LatLonPoint pt,
                              java.awt.Point p)

Projects a point from Lat/Lon space to X/Y space.

Specified by:

forward in interface Projection

Parameters:

pt - LatLonPoint

p - Point retval

Returns:

Point p

forward

public java.awt.Point forward(float lat,
                              float lon,
                              java.awt.Point p)

Forward projects a lat,lon coordinates.

Specified by:

forward in interface Projection

Parameters:

lat - raw latitude in decimal degrees

lon - raw longitude in decimal degrees

p - Resulting XY Point

Returns:

Point p

forward

public java.awt.Point forward(float lat,
                              float lon,
                              java.awt.Point p,
                              boolean isRadian)

Forward projects lat,lon into XY space and returns a Point.

Specified by:

forward in interface Projection

Parameters:

lat - float latitude in radians

lon - float longitude in radians

p - Resulting XY Point

isRadian - bogus argument indicating that lat,lon arguments are in radians

Returns:

Point p

See Also:

Projection.forward(float,float,Point)

inverse

public LatLonPoint inverse(java.awt.Point pt,
                           LatLonPoint llp)

Inverse project a Point.

Specified by:

inverse in interface Projection

Parameters:

pt - x,y Point

llp - resulting LatLonPoint

Returns:

LatLonPoint llp

inverse

public LatLonPoint inverse(int x,
                           int y,
                           LatLonPoint llp)

Inverse project x,y coordinates into a LatLonPoint.

Specified by:

inverse in interface Projection

Parameters:

x - integer x coordinate

y - integer y coordinate

llp - LatLonPoint

Returns:

LatLonPoint llp

See Also:

Proj.inverse(Point)

getName

public java.lang.String getName()

Get the name string of the projection.

Specified by:

getName in interface Projection

Overrides:

getName in class Cylindrical

getXPixConstant

public double getXPixConstant()

Returns the x pixel constant of the projection. This was calcuated when the projection was created. Represents the number of pixels around the earth (360 degrees).

Specified by:

getXPixConstant in interface EqualArc

getYPixConstant

public double getYPixConstant()

Returns the y pixel constant of the projection. This was calcuated when the projection was created. Represents the number of pixels from 0 to 90 degrees.

Specified by:

getYPixConstant in interface EqualArc